[App_rpt-users] RTCM Simulcast and 9.6 MHz Phase locking

Joe Leikhim rhyolite at leikhim.com
Fri May 12 15:08:31 EDT 2017


I have searched for documentation on the PCGM. can you point me to the 
enclosure?


On 5/11/2017 11:12 PM, Tim Sawyer wrote:
> The one it comes with.
>
> On Mon, May 8, 2017 at 11:24 PM, Joe Leikhim <rhyolite at leikhim.com 
> <mailto:rhyolite at leikhim.com>> wrote:
>
>     I wonder what kind of enclosure he had it in?
>
>
>     On 5/8/2017 11:10 PM, Tim Sawyer wrote:
>>     The PCGM were noisy. I know of a case where a ham using one was
>>     shut down by the site owner. Seems the PCGM was emitting a
>>     interfering signal on high band, around 158 Mhz.
>>
>>     On Mon, May 8, 2017 at 1:33 PM, Bryan Fields
>>     <bryan at bryanfields.net <mailto:bryan at bryanfields.net>> wrote:
>>
>>         I've been following this with some interest.  One of the
>>         fundamental issues with the PCGM was the master clock going
>>         to the radio was unable to be modulated.  This made low
>>         frequency signals (PL) distort, and digital PL was even worse.
>>
>>         Typically most radios use two point modulation, with
>>         modulation on the reference oscillator.  When you add an
>>         external reference you loose this.
>>
>>         Some base stations are designed to do two point modulation
>>         even on an external clock, the Quantar for example.  This
>>         station will even phase lock it's PL and DPL generation if
>>         provided a 1 PPS in addition to a clock.
>>
>>         If we could inject modulation into the clock generator
>>         simulcast performance would vastly improve.  I'd be
>>         interested to see your design to see if this would be a
>>         possibility.
>>
>>         Thoughts?
>>
>>         --
>>         Bryan Fields
>>         M: +1-727-409-1194 <tel:%28727%29%20409-1194>
>>
>>         On May 8, 2017, at 14:15, Reid Brandon <rfpowerguy at yahoo.com
>>         <mailto:rfpowerguy at yahoo.com>> wrote:
>>
>>>         Hi Joe,
>>>         I got a page with a pic of a man that rotated  around saying
>>>         DOWNLOAD NOT FOUND.
>>>         Try again!?
>>>         Tks Reid
>>>
>>>
>>>         On Sunday, May 7, 2017 12:25 PM, Pierre Martel
>>>         <petem001 at gmail.com <mailto:petem001 at gmail.com>> wrote:
>>>
>>>
>>>         I am very interrested in all this project. My email is VE2PF
>>>         @ VE2MRC dot com!
>>>
>>>         what radio did you used for the project?
>>>
>>>         Thanks for sharing!
>>>
>>>         Pierre
>>>         VE2PF
>>>
>>>
>>>         2017-05-07 12:32 GMT-04:00 Kevin Custer <kuggie at kuggie.com
>>>         <mailto:kuggie at kuggie.com>>:
>>>
>>>             Joe,
>>>
>>>             Why not consider do it as an article for Repeater Builder?
>>>
>>>             Thanks,
>>>             Kevin
>>>
>>>
>>>             On 5/7/2017 3:13 AM, Joe Moskalski wrote:
>>>
>>>                 I wanted to throw this email out to the group for
>>>                 all those who want to simulcast with the RTCM. For
>>>                 those who don't know, in order to make the RTCM
>>>                 suitable for simulcast you must have a more accurate
>>>                 9.6 MHz clock for the RTCM in order to ensure the
>>>                 audio sounds acceptable in the overlap areas. I did
>>>                 this a few months ago using 9.6 MHz OCXO's. This
>>>                 worked reasonably well. Not as well as I would have
>>>                 liked but the system was very usable, but of course
>>>                 I wanted it to be better. Since the PCGM
>>>                 (Programmable Clock Generation Module) is no longer
>>>                 available, I decided to roll my own as some say.
>>>                 I created a PLL circuit that can accept a 10 MHz, 1
>>>                 MHz or 100 KHz reference input and produce a phase
>>>                 locked 9.6 MHz out for the RTCM. I have been testing
>>>                 this over the past few days and it has made an great
>>>                 improvement in the audio quality in the overlap. The
>>>                 quality of the audio in the overlap areas sounds
>>>                 very, very good, it's very similar to what I expect
>>>                 to hear in commercial simulcast systems. My circuit
>>>                 is heavily based off of an old Motorola MSF5000 HSO
>>>                 PLL circuit that I was able to adapt and modify to
>>>                 my needs.  There are other uses for this circuit
>>>                 that make it attractive for simulcasting but I wont
>>>                 get into them here. I am will to share my schematic
>>>                 and bill of materials (digikey) with anyone. Please
>>>                 send me an email and I will be willing to share all
>>>                 of my information on the project.
>>>
>>>
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>>
>>     -- 
>>     --
>>     Tim
>>
>>
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>
>     -- 
>     Joe Leikhim
>
>
>     Leikhim and Associates
>
>     Communications Consultants
>
>     Oviedo, Florida
>
>     JLeikhim at Leikhim.com <mailto:JLeikhim at Leikhim.com>
>
>     407-982-0446 <tel:%28407%29%20982-0446>
>
>     WWW.LEIKHIM.COM <http://WWW.LEIKHIM.COM>
>
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> -- 
> -- 
> Tim
>
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-- 
Joe Leikhim


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Communications Consultants

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JLeikhim at Leikhim.com

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